JPS6129989Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an oil pump for a compressor that sucks lubricating oil contained in a casing of the compressor into the inner circumference of a rotating shaft.

[Technical background of the invention and its problems]

This type of oil pump has a suction blade inserted into the inner periphery of the rotating shaft, and this blade is rotated together with the rotating shaft to suck oil into the inner periphery of the rotating shaft. It is necessary that it is easy to insert into the inner peripheral part and that it does not easily fall off from the rotating shaft after insertion. Conventional suction vanes are made by twisting a strip of steel plate material into a helical shape, forming cut and raised pieces on one end edge that are bent in opposite directions, and attaching these cut and raised pieces to the inner peripheral surface of the rotating shaft. It is intended to be held in place by elastically abutting against each other. However, since the cut and raised pieces formed on the suction blade are short, they are difficult to deform elastically.
For this reason, the ease of insertion into the rotating shaft was poor, and the cut and raised piece had to be contracted and inserted using a bench or the like, resulting in poor assembly work efficiency. Furthermore, even after insertion, only a small portion of the tip of the cut and raised piece abuts against the inner circumferential surface of the rotating shaft, so the holding state is unstable and there is a risk that it may easily fall off. The oil slip phenomenon occurred due to the rotation of the rotating shaft, and the oil supply characteristics were not good.

[Purpose of invention]

This invention was made with attention to these points in mind, and aims to provide an oil pump for a compressor which has excellent insertability of the suction vanes into the inner circumference of the rotating shaft and which can reliably prevent them from falling off after insertion.

[Summary of the idea]

This invention is based on an oil pump for a compressor in which a suction vane for sucking oil is fitted into a rotating shaft immersed in lubricating oil housed in a casing of the compressor. The suction vane is formed by twisting a plate material into a helical shape, and the suction vane is deformed in the longitudinal direction into a curved or bent shape, and the diameter of the circumscribed circle thereof is smaller than the inner circumferential diameter of the rotating shaft. The intermediate part is held in elastic abutment with the inner peripheral surface of the rotating shaft, and the suction blade can be easily elastically deformed when inserted into the inner peripheral surface of the rotating shaft, making it easy to assemble. can improve sexual performance.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. Figure 1 shows a cross section of the lower part of a rotary compressor, where 1 is the casing, 2 is the rotor of the electric motor,
Lubricating oil a is contained in the inner bottom of the casing 1. The rotor 2 is fixed to the rotating shaft 3,
This rotating shaft 3 is rotatably supported by a main bearing 4 and a sub-bearing 5. A cylinder 6 is closely provided between the bearings 4 and 5, and a compression chamber 7 is defined by the inner circumference of the cylinder 6. A rotating body 8 is provided in the compression chamber 7 , and the rotating shaft 3 is inserted through the inner periphery of the rotating body 8 . An eccentric bulge 9 is integrally formed on the circumferential surface of the rotating shaft 3 at a portion facing the inner circumferential surface of the rotary body 8, and this bulge 9 abuts against the inner circumferential surface of the rotary body 8. As the rotating shaft 3 rotates, the rotating body 8 rotates eccentrically within the compression chamber 7, and this eccentric rotation draws refrigerant gas into the compression chamber 7, compresses it, and discharges it from a discharge valve (not shown). It is becoming more and more common. In addition, the rotating shaft 3
A plurality of oil supply holes 3a are drilled in the peripheral wall of the rotor, which are opened at sliding surfaces with the respective bearings 4, 5 and the rotating body 8.

The lower end of the rotating shaft 3 is immersed in oil a, and a suction blade 10 is inserted into the inner periphery of the immersed end. As shown in FIG. 2, the suction vane 10 is formed into a helical shape by twisting both ends of a strip plate, such as a steel plate, by 90 degrees or 180 degrees in opposite directions. It is formed to be deformed into a curved shape, for example, with a radius R in the direction. And this suction blade 10 is
As shown in Fig. 3, the diameter of its own circumscribed circle A is slightly smaller than the inner diameter of the rotating shaft 3, and as shown in Fig. 2, the width B on both sides in the curved deformed state is larger than the inner diameter of the rotating shaft 3. It's summery.

However, to explain the insertion procedure of the suction vane 10 formed in this way, first, the suction vane 10
One end of the rotary shaft 3 is exposed to the end opening of the rotary shaft 3, and then the whole is pushed into the inner circumference thereof. The diameter of the circumscribed circle A of the suction vane 10 is smaller than the inner peripheral diameter of the rotating shaft 3,
Moreover, since the entire shape is curved, it can be easily elastically deformed with a small force, and can be easily pushed in by hand. As the suction blade 10 is pushed into the inner periphery of the rotation shaft 3, an elastic force is generated that restores its curvature as it slides into contact with the inner periphery of the rotation shaft 3, and this overall elastic force causes the suction blade 10 to be compressed at both ends and in the middle. portion abuts against the inner circumferential surface of the rotating shaft 3 and is securely held.

The suction vane 10 incorporated in this way is connected to the rotating shaft 3
The oil a is sucked into the rotating shaft 3 and guided to each oil supply hole 3a.

Note that in the above embodiment, the suction blade is deformed into a curved shape, but it may be bent into a curved shape.

[Effect of idea]

As explained above, according to this inclination, the suction vane is formed by twisting a band-shaped plate material into a helical shape, and the suction vane is rotated in the longitudinal direction of the suction vane, the diameter of the circumscribed circle of which is smaller than the inner peripheral diameter of the rotating shaft. The blade is deformed into a curved or bent shape, and both ends and the middle part are held in elastic contact with the inner peripheral surface of the rotating shaft. During insertion, the suction blade can be easily elastically deformed, so it can be easily inserted by hand without using tools such as a bench, and after insertion, it can be held securely by its elastic force. This greatly improves assembly work efficiency. In addition, since both ends and the middle part of the suction vane are made to abut against the inner circumference of the rotating shaft, the number of contact areas between the two increases, reducing the amount of oil slip due to rotation of the rotating shaft, and improving oil supply characteristics. can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with FIG. 1 being a sectional view showing a part of the compressor, FIG. 2 being a perspective view of a suction blade, and FIG. 3 being a front view. 2... Rotor, 3... Rotating shaft, 10... Suction vane.

Claims (1)

[Scope of utility model registration request] In a compressor oil pump, a suction vane for sucking oil is inserted into a rotating shaft immersed in lubricating oil housed in a casing of the compressor. The suction blade is formed by twisting it into a shape, and the diameter of the circumscribed circle is smaller than the inner peripheral diameter of the rotating shaft,
1. An oil pump for a compressor, characterized in that the oil pump is deformed into a curved or bent shape in the longitudinal direction, and is held by elastically abutting both ends and a middle part against the inner circumferential surface of a rotating shaft.